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<p>Comments serve as a sort of in-code documentation. When inserted into a program, they are effectively ignored by the compiler; they are solely intended to be used as notes by the humans that read source code.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="comment.html#Syntax"><span class="tocnumber">1</span> <span class="toctext">Syntax</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="comment.html#C-style"><span class="tocnumber">2</span> <span class="toctext">C-style</span></a></li>
<li class="toclevel-1"><a href="comment.html#C.2B.2B-style"><span class="tocnumber">3</span> <span class="toctext">C++-style</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="comment.html#Notes"><span class="tocnumber">4</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="comment.html#Example"><span class="tocnumber">5</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="comment.html#References"><span class="tocnumber">6</span> <span class="toctext">References</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="comment.html#See_Also"><span class="tocnumber">7</span> <span class="toctext">See Also</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Syntax">edit</a>]</span> <span class="mw-headline" id="Syntax">Syntax</span>
</h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
<tr class="t-sdsc">
<td> <code><b>/*</b></code> <span class="t-spar">comment</span> <code><b>*/</b></code>
</td>
<td> (1)
</td>
<td class="t-sdsc-nopad">
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
<tr class="t-sdsc">
<td> <code><b>//</b></code> <span class="t-spar">comment</span>\n
</td>
<td> (2)
</td>
<td> <span class="t-mark-rev t-since-c99">(since C99)</span>
</td>
</tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td>
</tr>
</table>
<div class="t-li1">
<span class="t-li">1)</span> Often known as "C-style" or "multi-line" comments.</div>
<div class="t-li1">
<span class="t-li">2)</span> Often known as "C++-style" or "single-line" comments.</div>
<p>All comments are removed from the program at <a href="language/translation_phases.html" title="c/language/translation phases">translation phase 3</a> by replacing each comment with a single whitespace character.
</p>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: C-style">edit</a>]</span> <span class="mw-headline" id="C-style">C-style</span>
</h3>
<p>C-style comments are usually used to comment large blocks of text or small fragments of code; however, they can be used to comment single lines. To insert text as a C-style comment, simply surround the text with <code>/*</code> and <code>*/</code>. C-style comments tell the compiler to ignore all content between <code>/*</code> and <code>*/</code>. Although it is not part of the C standard, <code>/**</code> and <code>*/</code> are often used to indicate documentation blocks; this is legal because the second asterisk is simply treated as part of the comment.
</p>
<p>Except within a <a href="language/character_constant.html" title="c/language/character constant">character constant</a>, a <a href="language/string_literal.html" title="c/language/string literal">string literal</a>, or a comment, the characters <code>/*</code> introduce a comment. The contents of such a comment are examined only to identify multibyte characters and to find the characters <code>*/</code> that terminate the comment. C-style comments cannot be nested.
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-since-c99">
<td>
<h3> <span class="mw-headline" id="C.2B.2B-style">C++-style</span>
</h3>
<p>C++-style comments are usually used to comment single lines of text or code; however, they can be placed together to form multi-line comments. To insert text as a C++-style comment, simply precede the text with <code>//</code> and follow the text with the new line character. C++-style comments tell the compiler to ignore all content between <code>//</code> and a new line.
</p>
<p>Except within a <a href="language/character_constant.html" title="c/language/character constant">character constant</a>, a <a href="language/string_literal.html" title="c/language/string literal">string literal</a>, or a comment, the characters <code>//</code>
introduce a comment that includes all multibyte characters up to, but not including, the next new-line character. The contents of such a comment are examined only to identify
multibyte characters and to find the new-line character that terminates the comment. C++-style comments can be nested:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co1">//  y = f(x);   // invoke algorithm</span></pre></div></div>
<p>A C-style comment may appear within a C++-style comment:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co1">//  y = f(x);   /* invoke algorithm */</span></pre></div></div>
<p>A C++-style comment may appear within a C-style comment; this is a mechanism for excluding a small block of source code:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="coMULTI">/*
    y = f(x);   // invoke algorithms
    z = g(x);
*/</span></pre></div></div>
</td>
<td><span class="t-mark-rev t-since-c99">(since C99)</span></td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span>
</h3>
<p>Because comments <a href="language/translation_phases.html" title="c/language/translation phases">are removed</a> before the preprocessor stage, a macro cannot be used to form a comment and an unterminated C-style comment doesn't spill over from an #include'd file.
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="coMULTI">/* An attempt to use a macro to form a comment. */</span>
<span class="coMULTI">/* But, a space replaces characters "//".       */</span>
<span class="co2">#ifndef DEBUG</span>
    <span class="co2">#define PRINTF //</span>
<span class="co2">#else</span>
    <span class="co2">#define PRINTF printf</span>
<span class="co2">#endif</span>
...  
<span class="me1">PRINTF</span><span class="br0">(</span><span class="st0">"Error in file %s at line %i<span class="es1">\n</span>"</span>, __FILE__, __LINE__<span class="br0">)</span><span class="sy4">;</span></pre></div></div>
<p>Besides commenting out, other mechanisms used for source code exclusion are:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#if 0</span>
    <a href="io/puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"this will not be compiled"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="coMULTI">/* no conflict with C-style comments */</span>
    <span class="co1">// no conflict with C++-style comments</span>
<span class="co2">#endif</span></pre></div></div>
<p>and
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="kw1">if</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span> <span class="br0">{</span>
    <a href="io/puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">"this will be compiled but not be executed"</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="coMULTI">/* no conflict with C-style comments */</span>
    <span class="co1">// no conflict with C++-style comments</span>
<span class="br0">}</span></pre></div></div>
<p>The introduction of // comments in C99 was a breaking change in some rare circumstances:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1">a <span class="sy1">=</span> b <span class="co1">//*divisor:*/ c</span>
<span class="sy2">+</span> d<span class="sy4">;</span> <span class="coMULTI">/* C89 compiles a = b / c + d;
        C99 compiles a = b + d; */</span></pre></div></div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span>
</h3>
<div class="t-example">
<div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="coMULTI">/*
C-style comments can contain
multiple lines.
*/</span>
 
<span class="coMULTI">/* Or, just one line. */</span>
 
<span class="co1">// C++-style comments can comment one line.</span>
 
<span class="co1">// Or, they can</span>
<span class="co1">// be strung together.</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
  <span class="co1">// The below code won't be run</span>
  <span class="co1">// return 1;</span>
 
  <span class="co1">// The below code will be run</span>
  <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p><br> 
</p>
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: References">edit</a>]</span> <span class="mw-headline" id="References">References</span>
</h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd>
<ul><li> 6.4.9 Comments (p: 75)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd>
<ul><li> 6.4.9 Comments (p: 66)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd>
<ul><li> 3.1.9 Comments 
</li></ul>
</dd></dl>
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: See Also">edit</a>]</span> <span class="mw-headline" id="See_Also">See Also</span>
</h3>
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<tr class="t-dsc">
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